Akame ga Kill! - Killer of the East

There's a new Assassin in town. He comes from the East with a black over coat, and a hood covering his face. People who catch a glance of him are lucky if he lets you live. But his trademark, his mask, a gas mask with painted blood coming from the eye pieces.
What happens when this Assassin gets Sent on the same mission as Night Raid?
Who is the man in the mask?
And is it true that he can resurrect the dead?

(this story takes place soon after Susano's and Chelsea's arrival.)
I do not own this I only own the characters I create and their Teigu.